# Oratomic raises $475M Series B at a $5.4B valuation to build a fault-tolerant quantum computer

Canonical page: https://technooptimist.io/stories/oratomic-raises-475m-series-b-at-a-5-4b-valuation-to-build-a-fault-669b4919
Date: 9 Oct 2026
About: [Oratomic](https://technooptimist.io/companies/oratomic.md) · [Oratomic fault-tolerant computer](https://technooptimist.io/quantum/oratomic-quantum-computer.md)
Original source: https://dealroom.co/news/161158-oratomic-raises-475m-series-b-hitting-5-4b-three-months-after-its-series/

Pasadena quantum startup Oratomic has raised a $475M Series B that values it at $5.4B, up from $1.5B at its Series A about three months earlier. It is building a large error-corrected quantum computer and CEO Dolev Bluvstein expects it to be ready by 2030.

## Key facts

- ARCH Venture Partners, Spark Capital, Khosla Ventures, Index Ventures, General Catalyst and Bezos Expeditions co-led the round.
- Bluvstein argues a useful machine needs about 10,000 qubits, against a prior industry consensus of about one million.
- The source calls it the largest US Series B ever in quantum technologies, ahead of 62 prior rounds on record.
- Gartner expects more than half of quantum computing startups to close by 2030, and says buyers will reject qubit types that cannot deliver fault-tolerant computing.

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